Which of the following organisms exhibits
cephalization?
a. snail
b. sea anemone
c. sea star
d. sponge
e. Trichoplax
Answer: a
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Genetic studies of an animal show that eye color is controlled by an autosomal gene with the dominant allele (R) for red
eye color and the recessive allele (r) for yellow eye color. A second autosomal gene has the dominant allele (T) for paws with thumbs and the recessive allele (t) for paws without thumbs. The genetic cross RRTT x rrtt creates offspring with genotype RrTt. One of those dihybrids is mated in a testcross (RrTt x rrtt). Based on the principle of independent assortment, the testcross should produce offspring with the phenotype ratio ____.
a. 3 red-eyed with thumbs : 1 yellow-eyed without thumbs b. 1 red-eyed with thumbs : 1 yellow-eyed with thumbs: 1 red-eyed without thumbs: 1 yellow-eyed without thumbs c. 1 red-eyed with thumbs : 1 yellow-eyed without thumbs d. 9 red-eyed with thumbs : 3 yellow-eyed with thumbs: 3 red-eyed without thumbs: 1 yellow-eyed without thumbs e. 3 yellow-eyed with thumbs : 1 red-eyed without thumbs
Where is ATP synthase located in non-photosynthetic eukaryotes?
a. outer membrane of the cell b. nuclear envelope c. rough endoplasmic reticulum d. matrix of the mitochondria e. inner mitochondrial membrane
Which bird is a social parasite and lays its eggs
in the nests of other birds? a. catbird b. cowbird c. magpie d. Kirtland warbler e. blue jay
The interaction of sympathetic and parasympathetic
systems is best described as a. antagonistic. b. cooperative. c. overriding. d. synergistic. e. ineffective.